Adejare, A. T. “Taxation and Transportation: Granger Causality Approach in Nigeria”. Studia Universitatis Vasile Goldiș Arad, Seria Științe Economice, Vol. 31, no. 3, July 2021, pp. 1-20, https://publicatii.uvvg.ro/index.php/studiaeconomia/article/view/681.